How severe is CVE-2026-34953?

CVE-2026-34953 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-34953 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34953?

CVE-2026-34953 affects Praison Praisonai. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34953?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-34953 have an EU (EUVD) identifier?

Yes. CVE-2026-34953 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18925.

When was CVE-2026-34953 published?

CVE-2026-34953 was published on 2026-04-03 and last updated on 2026-06-17.

CVE-2026-34953

CVE-2026-34953 is a critical-severity vulnerability in Praison Praisonai with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18925
Weakness: CWE-863
Affected product: Praison Praisonai
Published: 2026-04-03
Last modified: 2026-06-17

Description

PraisonAI is a multi-agent teams system. Prior to version 4.5.97, OAuthManager.validate_token() returns True for any token not found in its internal store, which is empty by default. Any HTTP request to the MCP server with an arbitrary Bearer token is treated as authenticated, granting full access to all registered tools and agent capabilities. This issue has been patched in version 4.5.97.

Frequently asked questions

What is CVE-2026-34953?: PraisonAI is a multi-agent teams system. Prior to version 4.5.97, OAuthManager.validate_token() returns True for any token not found in its internal store, which is empty by default. Any HTTP request to the MCP server with an arbitrary Bearer token is treated as authenticated, granting full access to all registered tools and agent capabilities. This issue has been patched in version 4.5.97.
How severe is CVE-2026-34953?: CVE-2026-34953 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-34953 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34953?: CVE-2026-34953 affects Praison Praisonai. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34953?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-34953 have an EU (EUVD) identifier?: Yes. CVE-2026-34953 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18925.
When was CVE-2026-34953 published?: CVE-2026-34953 was published on 2026-04-03 and last updated on 2026-06-17.

References

https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-98f9-fqg5-hvq5

Affected products (1)

cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:*

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